Version 0.1.7: Fix terrain generation and README updates.

Version 0.1.6: Added custom_biome.py in sample_codes.

Version 0.1.5: Bug fixes, documentation changes, added utils.py, and updated sample code files.

Version 0.1.4: Bug fixes.

Version 0.1.3: Complete documentation, fix bugs, and remove duplicate functions.

Version 0.1.2: Add documentation.

Version 0.1.1: Refactor Code for more Object-Oriented-Programming.

Version 0.1.0: Fix bugs in C file and save_terrain function.

Version 0.0.9: Made pgzero and pygame interactive mode into one function and added documentation.

Version 0.0.8: Added C file for fast rendering of the Diamond–Square Algorithm.

Version 0.0.7: Added pos parameter in terrain and interactive terrain, added a function to save terrain as an image, and made interative mode avaliable in pgzero.

Version 0.0.6: Added functions to add/remove biomes.

Version 0.0.5: Added biomes.

Version 0.0.4: Added sample terrains.

Version 0.0.3: Fixed bugs and errors.

Version 0.0.2: Updated README file and added documentation.

Version 0.0.1: Main code for diamond-square added.
